检索结果-南通市图书馆

Volumetric Virtual environments

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2000年第1期15卷 37-46页

作者： He Taosong(Software Production Research Department, Bell LaboratoriesLucent Technologies, Naperville, IL 60566, USA)e-mail: taosong@*** Software Production Research Department Bell Laboratories Lucent Technologies Naperville USA

Driven by fast development of both virtual reality and volume visualization, we discuss some critical techniques towards building a volumetric VRsystem, specifically the modeling, rendering, and manipulations of a volumetric *** such as voxel-based object simplification, accelerated volume rendering,fast stereo volume rendering, and volumetric 'collision detection' are introduced andimproved, with the idea of demonstrating the possibilities and potential benefits ofincorporating volumetric models into VR systems.

关键词： volume visualization volume rendering virtual reality volumegraphics object simplification level of detail wavelets theory volumetric collisiondetection

CONDUCTIVe COMPOSITeS FROM POLYPYRROLe eLeCTROPOLYMeRIZeD IN A POLYUReTHANe MATRIX

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 1990年第2期8卷 149-157页

作者：宝净生 M. L. DAROUX M. LITT e. B. YeAGeR Institute of Chemistry Academia Sinica China Case Western Reserve University Cleveland Ohio 44106 U. S. A.

In order to improve the mechanical properties of polypyrrole, composites were made by electropolymerizing polypyrrole in a polyurethane matrix. Polypyrrole/polyurethane (PPY/PU) composite films containing CLO_4^-, BF_4^- or CH_3-C_6H_4-SO_3^- counter ions were made in a variety of solvent systems and characterized by SeM, electronic conductivity, FTIR, and mechanical properties. Composite films showing much greater fiexibility than pure polypyrrole were obtained, but their electronic conductivities were substantially lower. Measured eonductivities ranged from 0.001 to 8 S/cm, tensile strengths from 44 to 592 psi, and elongation to failure from 3 to 70%.

关键词： eG NB PP CONDUCTIVe COMPOSITeS FROM POLYPYRROLe eLeCTROPOLYMeRIZeD IN A POLYUReTHANe MATRIX IM ACN THF

Y-chromosomal microdeletions and partial deletions of the Azoospermia Factor c(AZFc)region in normozoospermic,severe oligozoospermic and azoospermic men in Sri Lanka

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2006年第1期8卷 39-44页

作者： L.Fernando J.Gromoll T.R.Weerasooriya e.Nieschlag M.Simoni Institute of Reproductive Medicine of the University Münster University HospitalD-48129 MünsterGermany Reproductive Biology LaboratoryFaculty of MedicineKarapitiyaGalleSri Lanka Institute of Reproductive Medicine of the University Münster University HospitalD-48129 MünsterGermany Reproductive Biology Laboratory Faculty of MedicineKarapitiyaGalleSri Lanka

Aim： To assess for the first time the occurrence of Y chromosomal microdeletions and partial deletions of the Azoospermia Factor c （AZFc） region in Sri Lankan men and to correlate them with clinical parameters. Methods： In a retrospective study, we analyzed 96 infertile men （78 with non-obstructive azoospermia） and 87 controls with normal spermatogenesis. AZFa, AZFb, AZFc and partial deletions within the AZFc region were analyzed by multiplex polymerase chain reaction （PCR） according to established protocols. Results： No AZFa, AZFb or AZFc deletions were found in the control group. Seven patients in the group of infertile men were found to have deletions as following： one AZFa, two AZFc, two AZFbc and two AZFabc. The relative distribution of these patterns was significantly different compared with that found in the German population. extension analysis confirmed that the deletions occurred according to the current pathogenic model, gr/gr deletions were found to be equally present both in the patients （n = 4） and in the control group （n = 4）. One b2/b3 deletion was found in the patient group. Conclusion： These results suggest that the frequency and pattern of microdeletions of the Y chromosome in Sri Lankan men are similar to those found in other populations and confirm that gr/gr deletions are not sufficient to cause spermatogenetic failure. （Asian J Androl 2006 Jan; 8： 39-44）

关键词： Y chromosome male infertility gr/gr b2/b3 microdeletion normozoospermia azoospermia factor c

On the existence of Absolute Instability in Bluff Body Wakes

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1996年第3期1卷 4-8页

作者： Chuanping SHAO Xuequan e & Wei WANG (Laboratory of Applied Fluid Mechanics, Institute of Mechanics, Chinese Academy ofSciences, 15 Zhong Guan Cun Road, Beijing 100080, China)e-mail: shaocp@cc5 . Imech .ac. cn Laboratory of Applied Fluid Mechanics Institute of Mechanics Chinese Academy of Sciences 15 Zhong Guan Cun Road Beijing 100080 China

The wake stability of steady flow past a circular cylinder has been studiedexperimentally An impulse perturbation signal（very short in time, finite in amplitude） wasgiven to the wake from a small hole on the back of the cylinder, and its long time evolution inthe wake was detected by a hot film probe at a fixed point. The test Reynolds number rangeRe=30 ~ 320. The restult shows that （1）ahsolute instability exists in the wake when Re=55～320. （2） The absolute region extends from 0.5 eynlods number increases from 55 to 200.

关键词： absolute Instability wake circular cylinder

Vessels Segmentation in Angiograms Using Convolutional Neural Network: A Deep Learning Based Approach

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in engineering & Sciences 2023年第7期136卷 241-255页

作者： Sanjiban Sekhar Roy Ching-Hsien Hsu Akash Samaran Ranjan Goyal Arindam Pande Valentina e.Balas School of Computer Science and engineering Vellore Institute of TechnologyVellore632014India Department of Computer Science and Information engineering Asia UniversityTaichung41354Taiwan Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung406Taiwan Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology School of Mathematics and Big DataFoshan UniversityFoshan528000China Medica Superspecialty Hospital Kolkata700099India Automation and Applied Informatics Aurel Vlaicu University of AradArad310130Romania

Coronary arterydisease(CAD)has become a significant causeof heart attack,especially amongthose 40yearsoldor *** is a need to develop new technologies andmethods to deal with this *** researchers have proposed image processing-based solutions for CADdiagnosis,but achieving highly accurate results for angiogram segmentation is still a *** different types of angiograms are adopted for CAD *** paper proposes an approach for image segmentation using ConvolutionNeuralNetworks(CNN)for diagnosing coronary artery disease to achieve state-of-the-art *** have collected the 2D X-ray images from the hospital,and the proposed model has been applied to *** augmentation has been performed in this research as it’s the most significant task required to be initiated to increase the dataset’s ***,the images have been enhanced using noise removal techniques before being fed to the CNN model for segmentation to achieve high *** the output,different settings of the network architecture undoubtedly have achieved different accuracy,among which the highest accuracy of the model is 97.61%.Compared with the other models,these results have proven to be superior to this proposed method in achieving state-of-the-art results.

关键词： Angiogram convolution neural network coronary artery disease diagnosis of CAD image segmentation

A post-classical theory of enamel biomineralization… and why we need one

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Oral Science 2012年第3期4卷 129-134页

作者： James P Simmer Amelia S Richardson Yuan-Yuan Hu Charles e Smith Jan Ching-Chun Hu Department of Biologic and Materials Sciences School of Dentistry University of Michigan Ann Arbor USA Facility for electron Microscopy Research Department of Anatomy and CellBiology and Faculty ofDentstry McGlIUniversity. Montreal Canada

enamel crystals are unique in shape, orientation and organization. They are hundreds of thousands times longer than they are wide, run parallel to each other, are oriented with respect to the ameloblast membrane at the mineralization front and are organized into rod or interrod enamel. The classical theory of amelogenesis postulates that extracellular matrix proteins shape crystallites by specifically inhibiting ion deposition on the crystal sides, orient them by binding multiple crystallites and establish higher levels of crystal organization. elements of the classical theory are supported in principle by in vitro studies; however, the classical theory does not explain how enamel forms in vivo. In this review, we describe how amelogenesis is highly integrated with ameloblast cell activities and how the shape, orientation and organization of enamel mineral ribbons are established by a mineralization front apparatus along the secretory surface of the ameloblast cell membrane.

关键词： ameloblastin amelogenin enamelin mineralization front tooth

An overview of the role of neutrophils in innate immunity,inflammation and host-biomaterial integration

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2017年第1期4卷 55-68页

作者： Gretchen S.Selders Allison e.Fetz Marko Z.Radic Gary L.Bowlin Department of Biomedical engineering University of MemphisMemphisTNUSA Department of Microbiology Immunology and BiochemistryUniversity of Tennessee Health Science Center(UTHSC)MemphisTN 38163USA

Despite considerable recent progress in defining neutrophil functions and behaviors in tissue repair,much remains to be determined with regards to its overall role in the tissue integration of *** article provides an overview of the neutrophil’s numerous,important roles in both inflammation and resolution,and subsequently,their role in biomaterial *** function in three primary capacities:generation of oxidative bursts,release of granules and formation of neutrophil extracellular traps(NeTs);these combined functions enable neutrophil involvement in inflammation,macrophage recruitment,M2 macrophage differentiation,resolution of inflammation,angiogenesis,tumor formation and immune system *** exhibit great flexibility to adjust to the prevalent microenvironmental conditions in the tissue;thus,the biomaterial composition and fabrication will potentially influence neutrophil behavior following *** review serves to highlight the neutrophil’s plasticity,reiterating that neutrophils are not just simple suicidal killers,but the true maestros of resolution and regeneration.

关键词： neutrophil tissue engineering NeTosis tissue regeneration host response inflammation

MRI analysis and clinical significance of lower extremity muscle cross-sectional area after spinal cord injury

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2017年第5期12卷 714-722页

作者： Robert M.Lester Kori Johnson Refka e.Khalil Rehan Khan Ashraf S.Gorgey Spinal Cord Injury and Disorders Center Hunter Holmes McGuire Veterans Administration Medical Center (VAMC) Richmond VA USA Department of Physical Medicine and Rehabilitation Virginia Commonwealth University Richmond VA USA Radiology Service Hunter Holmes McGuire Veterans Administration Medical Center (VAMC) Richmond VA USA

Shortly after spinal cord injury（SCI）, the musculoskeletal system undergoes detrimental changes in size and composition, predominantly below the level of injury. The loss of muscle size and strength, along with increased immobility, predisposes persons with SCI to rapid and severe loss in bone mineral density and other health related consequences. Previous studies have highlighted the significance of measuring thigh muscle cross-sectional area, however, measuring the size and composition of muscles of the lower leg may provide insights on how to decrease the risk of various comorbidities. The purpose of the current review was to summarize the methodological approach to manually trace and measure the muscles of the lower leg in individuals with SCI, using magnetic resonance imaging. We also intend to highlight the significance of analyzing lower leg muscle cross-sectional area and its relationship to musculoskeletal and vascular systems in persons with SCI.

关键词： spinal cord injury magnetic resonance imaging pressure ulcers venous thromboembolism cardiovascular disease bone health

糖尿病合并尿路感染患者酮症酸中毒的影响因素分析

在线全文

学校读者我要写书评

暂无评论

医学新知 2024年第3期34卷 276-281页

作者：刘文向世强龚雅琪袁华兵徐金娥武汉科技大学医学院武汉430065 天门市第一人民医院内分泌科湖北天门431700

目的探讨2型糖尿病合并尿路感染患者糖尿病酮症酸中毒(diabetic ketoacidosis,DKA)的临床特点及影响因素,为DKA预防及早期干预提供参考。方法回顾性收集2022年1月至2023年9月天门市第一人民医院收治的糖尿病合并尿路感染患者的病历资料... 详细信息

目的探讨2型糖尿病合并尿路感染患者糖尿病酮症酸中毒(diabetic ketoacidosis,DKA)的临床特点及影响因素,为DKA预防及早期干预提供参考。方法回顾性收集2022年1月至2023年9月天门市第一人民医院收治的糖尿病合并尿路感染患者的病历资料,根据住院期间是否发生DKA分为DKA组和非DKA组,比较分析DKA发生的影响因素。结果共纳入137例患者,其中DKA组35例、非DKA组102例,DKA发生率为25.55%,两组患者在年龄以及空腹血糖、糖化血红蛋白(HbA1c)、血清降钙素原(PCT)、尿白细胞水平方面差异均具有统计学意义(P<0.05)。多因素Logistic回归分析显示,年龄≥60岁[OR=2.369,95%CI(1.013,5.541)]、血清PCT≥0.5 ng·L-1[OR=3.234,95%CI(1.215,8.609)]、HbA1c≥7%[OR=2.958,95%CI(1.130,7.743)]是糖尿病合并尿路感染者发生DKA的危险因素。结论年龄≥60岁、血清PCT≥0.5 ng·L-1及HbA1c≥7%是糖尿病合并尿路感染者发生DKA的独立危险因素,临床医生应及时识别,尽早预防。

关键词：糖尿病酮症酸中毒尿路感染危险因素